Optimum shapes for lightweighted mirrorsTwo types of monolithic lightweight mirrors with arched backs, the center-supported single arch and the ring-supported double arch, are discussed. It is shown that, assuming a maximum permissible rms tolerance of 6 x 10 to the -6th in, the single arch mirror weighs about 50 percent of an equivalent solid mirror up to a diameter of 24 in. The single arch is relatively simple to construct and uses a simple center support. Where a better figure is required, or for larger sizes, the double arch is superior in performance to the single arch. The weight of the double arch will vary from about 50 to under 40 percent of an equivalent conventional mirror as the diameter is increased from 20 to 144 in. Further weight reduction for the double arch is possible through the reduction of the size of the support.
Document ID
19830049809
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Vukobratovich, D. (Arizona Univ. Tucson, AZ, United States)
Iraninejad, B. (Arizona Univ. Tucson, AZ, United States)
Richard, R. M. (Arizona, University Tucson, AZ, United States)
Hansen, Q. M. (Arizona Univ. Tucson, AZ, United States)
Melugin, R. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1982
Subject Category
Optics
Meeting Information
Meeting: International Conference on Advanced Technology Optical Telescopes